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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f61bb6c19488f4f9c79cfdea05169f6a3e9f576526694af98e6e036c012d11e' 
  AND token = '/hiZWOEGkTI2TMncAj8kCZcEtZRneR2lI38f+wjUEjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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