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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfea7b701d22b0367931db4948e82ddd5dd38e6ced4ddadd38d225c307d9b93' 
  AND token = 'lfgPriB/Z0vP25eKi4CeC8njVEs8325CBZ4n3ebMF5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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