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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c42eee303c934d9797b8ed2d0a1bb5b7539c02851523844bd6773cbd8b2158' 
  AND token = 'fn4U8oC2jeR2g0B9ukgN9W9HSV9H7YNLkwg645XGEK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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