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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02d14a0ecde2c86af74b0bb2de63ebce02d5b763bf4b0704c3d264450ec59af' 
  AND token = 'U8YQYPdmRY5huqlMi93cVXQSPBwgknbTEe1o28XYJHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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