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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce96c184fcc8f269e7182fcf5ac40f0d5f5cbcfc6cec224f16f6db603f39270' 
  AND token = 'ZVjts4HLx0RYj7huQXfYRqCRxnW9zpQdQkDvjspgVDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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