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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d1e9442a24b123de5b6b19b64692c123d4331a0207a68747dad11bec7ca69a' 
  AND token = 'i0VAdyOpqmjoL1lNEoXhbS6v5a/rTleubbSUAIlOKxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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