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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4d6adb39a589dab2c3510869d9060ab2d26c7d888ad6bb29108d97d26149b7' 
  AND token = 'Pc7qFJviLXAmCK9dn2YzwpLnS9MuyVZnNhf3WZvJdE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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