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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3758a599b8c89bb9c5fb7947c409e77c53de7f94586c4c6a2515c23d65ea3040' 
  AND token = 'q0VJaKPcXAnY76ouOr94GKQvuOLiJZsxgOv3cVMRMlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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