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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee895f2db1e104c201f776b214cfcc54552fe62f418ba35602dd93d147be4bd' 
  AND token = '0IkPmYTgGL5IjT2ASZmJo4k1wtaSgLT4E8iSrK8WjdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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