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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf40dfa770e8f05cb90b289efa914aaa1d99e159f6aea90676838b128385799b' 
  AND token = '8Si7A6jVnDhysnTTKJH2G5jPSouFWtf20qVWY8fb07g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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