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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97460e500089307a83b9c9992fa3c6312cc7265dd263556208a35a552cedb9ae' 
  AND token = 'MyXM1k1iHdhwIVmMaRREIhKlYREjWog8Vtj6KL1FXa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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