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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981de8fefcb06040ce4c09c1f5392146572c30a45d8a49d226d6854274b7450e' 
  AND token = 'vusfAEiupsfTaysmf7IMbBTIkMR3ThnAudoHcu4ipyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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