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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9969cd9e75399526a63b11d9e3372ab2ebf366d11405185a186ec74306eb9929' 
  AND token = 'jlzXh9BCwNjDMedclMjwzy179jJqbYTV9dloB/aBC/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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