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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209fe188617a7f0289db85e9e36663cb1aa49aab14cc30fed2644500387acbd5' 
  AND token = 'd9e55NHtBoxNfSlYfg0uYva4UTbGIVunndJP3qeKSKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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