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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b091adff84d4e62bf0acae27b6af4468e5d53ecefa5dc5acefba6fabb2760a' 
  AND token = 'N4EHPWn67lG8DRw0d0QM7iJYg/8YP/CHHbzSKCR2BZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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