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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43604a01e870a491d08b0646e43ed5de1ca0e4ea19034f00c896e00ad7a731ac' 
  AND token = 'zB8qzvmKsJomH2ihXEbB4JEN086Wzt+lNzxL1ny49x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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