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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ecba8ac9808965f9e865d04a088858eac35b557f4a6c73d1ed6dccd7f06b9f' 
  AND token = 'IOArLGGJI/3/cs1152/MuRo8yLEj2yQhX+dPBKJr9H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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