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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f898fe8a35cfbc233bf57de844c2613f6c88ce8bb3180cca35a30c31fd28e54' 
  AND token = 'gQzror4CVb+fK6CPxtobgVsHe94XfyM7F8uGkk+crzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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