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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f81db98b957d1a4dc951265f384f7b29e679aa38614aea79e11374dfb7799ed' 
  AND token = '0EPuBPP06gKVGtk8ofUISutWnqkC9aFNM+QVZoEEUmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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