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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bcf9768d80ae190d426fca44ef35d8be99b0761055e37f7bc15423db8bded0' 
  AND token = 'AtLF0dF7qd8hgZgZXsZhBUTyenWUfdBf2vSqMgRMLLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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