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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f293e7bc16a9c8ef95b9fbe261a038619efa501916e8aa1ed5f7ca0bbc8d5e' 
  AND token = 'iOSZaKT/nDVq/++Uw5sAWKDqsbQPLg+nZpx/irNKaJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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