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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce67ef8884e2becea1812ee1a4fcf36647ae2f3f4f145bae9b83006c523fdadc' 
  AND token = 'hzu0a4Cs89cQ5A5l9IorB80EdsP1UtS1bqSkoc3f0Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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