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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf1617b1e3c929c5b57679366aa5a6171a1ec9c6652fdb4d2a3881258cdaf82' 
  AND token = 'JrV0cYxL3dfuchL5ryS+4xQbFmNOPKY74JGq0hSip20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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