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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7de675980ae2daed87bf8d6643ac0bdee8454f4cd6de674a784628e85359ed7' 
  AND token = 'dmbq6njkUEtbwiXIFbRQCNsweFmwf62KwN7x/nhPRaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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