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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f29050c1fc4211038fb36bf9bc996dfacd5fbd747e623a013afcb0821bc89f' 
  AND token = 'RBlSZd0bj5k/KMU26obPOlsdlTDNx28tPaePX/S379c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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