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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80065da9d64dd5e61624a2f52800ccb648e195ea15006047c0b2d1d6edaef5f' 
  AND token = 'BCWAImbiDtwBcESqWveN3LZfVFUsmDFcxl5vLj2ieOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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