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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c13fb1d6e90e5b3593352cc0bd30cc2a5ab86be85661ffb5971682ac78e9f4' 
  AND token = 'bMUQ60bL0FttnxMhQn27P9a0nkUWBzphkUV85oWyYFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}