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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801e95ddd4fb47336274302c0900c874936508096bfb4481daa0cdcfdd8ac1d8' 
  AND token = 'QLXS0EvDOPp9lz32cVz4IJ4zmhBRXNkPsxTu1jJ51Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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