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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b008b0fd60d19f203871278f4c794a43235dd66ef294ba03672646f12cc8cb95' 
  AND token = 'oKxqeNbKqjKiUAW3lOi2MMoBwp1lhq53N2WLNuT1kCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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