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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85020e8230d8d60a29260ce33cea5d054c35f61fe1ee17166a7ff6335d13a46e' 
  AND token = '1MjvfqijyheqRRnExPxhU0QZBaXDvU0zeRoMztUqrHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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