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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a649e6b6fbe27c71db70a22651984da50aab8c245e714de650fa954e41588f' 
  AND token = 'bgXw7ODR9tmonfUf1wTAf84rqiMIa51swfM0WxzPriM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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