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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1c73957c35e5d1b9e0fdcd2a1a3acd3c4d099eca904e17fc19b6e43af84e03' 
  AND token = 'FRA0Nh5ArIrAgK7fdtIttCPg1oSQNOSkrtD/JaRqJH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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