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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1679ad4e1b897870c636ed972437fbe82a0052429b2cc074e1250a374038c6c0' 
  AND token = 'oKNLbyvXSN/tw/DMgbNFRHscuBM1d2AkjuuXwDLM+iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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