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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903c553ffa08aec85992b822768ab8af86f4b17c0eeffb29dff05bd3b5228218' 
  AND token = '83lCVkvSJDUfJ/yHbWGNQtt/IwG96ybFVCQul0U5gsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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