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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd353c36635ca91012f08f8426e2bdf5afc88ee5de2078c8bf9aae26c7e3927' 
  AND token = 'jC015rg4kp+xgNgU2TrlnpFI59f2X+snKcKFFKsd3hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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