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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fa8c407b9fe8316eaf372705aabe2ec8bcd34e00d514736a3ac4676f0a1b55' 
  AND token = 'BRjU1KGMhXmBCFwivqeWIe6uXkPvaGBeSgxBrh70mvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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