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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4058888ca47b0c8e1fe4983c1f2360f008702c1a2dc6a60324c7ad4745cf60a5' 
  AND token = 'LmoyJjvDNsFEDteSdRb5z9k2B/mF5usHKntCEGZy3TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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