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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb9183efcc4e2dcfaba4b3b0259090f542b83ac15c8e2fa4f31377f0bd5235b' 
  AND token = 'RTZdvBwjA1ef4XT9aytXrKNn0FfFC6khUe78rgZAb9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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