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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fceb46c7c11f7bd5863e3cc9dc6936eaf2f7894ba1566ffa32e4ce2aa56031' 
  AND token = 'tE7o4O3v72Si4perm/Z6WwnnkgTyA4j7MmHdXVviKGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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