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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdc67f4e0ff9d608b9da0d92b76a19ca5a43fb68a3ceb7183ccb7be5bc57d3e' 
  AND token = 'FNT4lNicyjqvCSW8+dZYTf2SdloqtM5Zn4yR5wNID7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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