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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46410e4ddf752ae14cdb04d7064707d9e86f5948a1cb8aa7cf8a0e1f74464a83' 
  AND token = 'XT2fGJJ6Zv+REvVf9NZjOzT9yC8XinISgkAkoaopDoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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