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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38622130e4f2c8a3ca95901a9e055096bd7a13882e2cea7348c8dfeeb37b293a' 
  AND token = 'jp2SOhgKsgenjqb3pzCgM+ZIiv6mIUPY3341axp4t4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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