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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba8e8dfb7239109a3e06077e3f40fc35ce0f7d4f36b3eee4e2ac6920277ffbf' 
  AND token = 'bijT0jZRfKIa0TQIr8D6tjftbmFqI52y+gpkZD+jEUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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