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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d2cfd83a3a350de6585152098a04271f1b190ce556eedf766dd2baf1a52fd4' 
  AND token = '+y4bnBXHZqdpz6dqaJ/OkO8R/8lcmcKMSUckxHiEWTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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