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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2aa062bc44fe8f5c4913c56d321020bf34a62a72eef149b7ef55e25e9909972' 
  AND token = 'xjBLcitMGVmSYZbnuCQ4ZvoFJt2BBsMPgg5YDsmtR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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