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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fabfd61280e0be60b1bef9b18507f336aff2250c76b4468cc1a5c46c890cdb' 
  AND token = 'uFidFs511HReKXSpkq84r/Hn9J7uKm2+7usjJaxcGck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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