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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a1b094f446de8e7ad06870e39c4f5cf5a8f675e2c24f02d88c71b8335731ad' 
  AND token = 'kaKeDIqBjcT5A6sVDmA7b1t6eKfTdSFqsH/bTGLavcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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