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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8fb4e6eddf045ff8a42ff91a3ace7897683e1e64084758136cfe859f661ea3' 
  AND token = '6n/pTvHX1FqH58o3T9nc7rIhhws6qdGMDmBQYS8oK3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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