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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa858b2a3bcc77c96c6e24768352599e132e82a7076febd9b201c7e271d0787' 
  AND token = 'QqsF6Ad7cQ2mW3bHVV4zHqaG67olKkDeXjKFS4FgfgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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