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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b06effd6b8777eeb6686519f1db33c07a6a22c7d7bd94dc94bdf5a0df4d98c' 
  AND token = 'sf5+gd/vd6hcacos9DDvAH7UjkQ6xkkk0e0KGu6dLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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