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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4adecab10f94749ca50ce756f32af9c9c43764c71bcf64af3b5014672ba729' 
  AND token = '4SGCokV43ujJriOKVDFo1RpzUC5ljl0g1yj1IvbwiIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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