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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2f9f39692bc8932dcea37265471eaa1e075fa054dd49b323847b5312ed8eea' 
  AND token = 'aka3ZYDOi7J9PLMep5pHYBWB5O1Ce+uB34MwsbYCJ6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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