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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a784c11eb4dfefa518df124d0b19da2d50a390081d595119eb1452c750127647' 
  AND token = 'fY6E9cmG1/iHeS+eyor66lYKi/y31R+BPllCtKiRjoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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